platform/x86: thinkpad_acpi: Support for trackpoint doubletap

Lenovo trackpoints are adding the ability to generate a doubletap event.
This handles the doubletap event and sends the KEY_PROG4 event to
userspace. Despite the driver itself not using KEY_PROG1 - KEY_PROG3 this
still uses KEY_PROG4 because of some keys being remapped to KEY_PROG1 -
KEY_PROG3 by default by the upstream udev hwdb containing:

evdev:name:ThinkPad Extra Buttons:dmi:bvn*:bvr*:bd*:svnLENOVO*:pn*:*
 ...
 KEYBOARD_KEY_17=prog1
 KEYBOARD_KEY_1a=f20       # Microphone mute button
 KEYBOARD_KEY_45=bookmarks
 KEYBOARD_KEY_46=prog2     # Fn + PrtSc, on Windows: Snipping tool
 KEYBOARD_KEY_4a=prog3     # Fn + Right shift, on Windows: No idea

Signed-off-by: Mark Pearson <mpearson-lenovo@squebb.ca>
Signed-off-by: Vishnu Sankar <vishnuocv@gmail.com>
Link: https://lore.kernel.org/r/20240417173124.9953-2-mpearson-lenovo@squebb.ca


[hdegoede@redhat.com: Adjust for switch to sparse-keymap keymaps]
Tested-by: Mark Pearson <mpearson-lenovo@squebb.ca>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Mark Pearson <mpearson-lenovo@squebb.ca>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20240424122834.19801-23-hdegoede@redhat.com